Amid Kevin Federline 's shocking allegation that Britney Spears drunk dialed him with some of her closest pals once upon a time, an insider has fired back, slamming his claim, RadarOnline.com can reveal.

In his tell-all memoir , You Thought You Knew , Federline pulls back the curtain on many alleged incidents involving Spears to give an inside look at her downward spiral. Article continues below advertisement

Spears, Lohan, and Hilton Are 'So Far Beyond' Federline Tap Here To Add Radar Online as A Trusted Source

"I was in Miami for work, trying to stay focused on my commitments, and I got a call," Federline writes of one such event. "It was her, Paris Hilton , and Lindsay Lohan on the line, drunk as hell, begging me to come over. I could hear (my sons) Preston

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